Perimeter Air Sampler 8 (Northeast Corner of Building 50)
Thorium-230 Alpha Spectroscopy Monthly Results
Action limit for thorium-230 is 2.00E-14 µCi/ml (10 CFR 20 Appendix B Table 2).
Pre-operational average thorium-230 baseline activity concentration is 2.8E-17 µCi/ml.
Month	Hours	Lab Qualifier	Activity Concentration ± Uncertainty (µCi/mL)
Jan-06	843		2.0E-17	±	1.2E-17
Feb-06	674		5.0E-17	±	2.3E-17
Mar-06	693		3.0E-17	±	1.9E-17
Apr-06	671		1.7E-17	±	1.8E-17
May-06	839	U	3.2E-18	±	7.5E-18
Jun-06	649		1.1E-16	±	5.1E-17
Jul-06	865		1.8E-17	±	1.8E-17
Aug-06	670		2.3E-17	±	1.8E-17
Sep-06	676	U	7.7E-18	±	9.6E-18
Oct-06	673	U	1.5E-17	±	1.3E-17
Nov-06	839	U	2.8E-18	±	4.7E-18
Dec-06	501		2.6E-17	±	1.8E-17
Lab Qualifier Flags
NR	No data reported for this radionuclide due to laboratory error or data found unacceptable during review
J	Nuclide identified, the associated numerical value is approximated
U	Nuclide not detected above the reported MDC or 2 sigma counting uncertainty
0.00E+00	Not detected in spectra
NA	Data not available at this time